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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38a0dd5c9bed051b7df861ec958b4a332f2947f6b98bda57441f28a8e66859e' 
  AND token = '53IA2riCd7lD7bCzpXbyC7buMJh2cdNalCBIVcScNcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}