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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeeab3bd6eacc22631ccc98ea4ad5cbbd03d60f5b86e23c9c320a2aa549b8fb7' 
  AND token = 'c9PciSl69tRTXXeNXlMRMsa2UWaY0/erwfJN7RXy3x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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