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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '541df08308a40943c1f1571aa10b589e6ce7361dce66a1f23069cb0aa22543af' 
  AND token = 'PrWGTuZfQVJDdWxbP2WiogCfQNLcUfdlhzfm0mUsb+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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