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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842fc55c7287df53f81ca328a7833330e1fcb6c4e134348773fd297c42e523bf' 
  AND token = '3Dv0KDw3q2AYoBAwuc/lJ3n+ynEr8UbbUXHEbd9LRZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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