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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff5d82164c6a15b42c3de45ff55fb704d74ea6669fe143c9ec12c8075087993' 
  AND token = 'SKJTLzUA7MwX831fZmRZk5psznL42Gm26CzPlCFooaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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