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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8685db32bec2552c5ee9a2d7eddeaeef1ac4594a454bc8e49e1a52ac818cbd36' 
  AND token = 'PdFL9HktuxamovFiClndLM/57A6cixF+GUVR0NhrOhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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