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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58560edf2614682fea6d16ecde0a65e5e3c7926b98879d596dff04c670aafe31' 
  AND token = 'LQd/uIr9K4uOjiBCViJYSrgtmkJrROmnffXzWKwJn0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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