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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1032af62fc68dc907d1364fc0528205db918a71366cde21361e1d46a9f8cb6b' 
  AND token = 'Y8RLGtHmFkNgwStT8q4c7H9cPR9eI+bucXhdJ2GKDRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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