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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575ed4f0f02f9b2a88f30aebe61994fb7982bfb53c82994731402db0f0a86756' 
  AND token = 'oGCCmG6Tv3akPd89DYkWFanDbKZQo+FPjnQ2M6cH3zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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