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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f3a3dd9fb4440fd93c50b6acc59ffd1504963e3074622b7fbac435c1f685bd' 
  AND token = 'MtyoraHTIjMmzFT316+Ijt6wmOcv/fOG9qJP5VQ8rOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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