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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '841de9bc31193ecbb7b54df5dcd749cdcfcd6ffb59d22784ceefe6cdfbcd8c79' 
  AND token = 'galZn9hr7UIOwV2sX4XETR2CMVgL+HllSBtrJwHVacQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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