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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4587ad77b82d1a49fe1459e73545b4ad37354c640a980935be058eed0f3c9b6e' 
  AND token = 'I7y6tuHSaOLqbtRFchGvANFsyK5E1TGpoIPqTpcap3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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