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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc0f0133ec014fff159426c0ba7c6ebe7974e93dea0b18855f19b0946966b8d' 
  AND token = 'RqG6Uh6aIZ2RMLEQFwZM/8wUCwrFMdsU+U5J3bUcqJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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