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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a7f0ac3d0b6a7e7cd7fa0e408c8bb08d97b91e399bfba564f6551c07fccb27' 
  AND token = 'ibFE/TMCQ5UUTCe/QZ8QLRf3lmNlD0e1wuUcYypMKpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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