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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae273f5faf675639a2c7ae9a6e42b03dcfedfed980da6f02ddef9ade393982f' 
  AND token = 'gIQx2i1Yv8SYiBWhGajBvmwdjWqXuXHipiq2sdEAyPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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