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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd709ac23bc9cca2501d4701fc1a2e0e9f7f133e35a384a5f2ac9bbe9a421d536' 
  AND token = '13qnGyOD4OoC3VMQ/gjYSk6lHX/b3hiG3TSd/66CV10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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