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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5fabf8bfeac95c16d04f55cf03955c6115603d8f1c6c2aaa7e901d00b73b8f7' 
  AND token = 'gs2L0oF1gQKQqy+XqAOqAZZKCx/eB+wEW2JtqP1H/TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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