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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48e536766ab856bc13795db84f394a2645e6afe1cca58158cc2e6a904e6e89c' 
  AND token = '5dvxmC0VpvooYpUssgWRPeQQLaxo15iIgiS6Dhoja9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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