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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a312bc5ae5db0d0c22991b0b090e4f33e3a112aadd37b44a767a8a7d3afc9509' 
  AND token = 'XRIGDqRaf3uIO3PEkYsi/+lGNtmn+MSdwM3RgKwMdz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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