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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4e5ac347e69a836c415e6e9a191928b79de099e2fda61943dca06d32684af4' 
  AND token = 'Yo4goSk+9NDkgl6aeK4p8ZrXujTNj8La68449K8MRRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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