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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e35cab63b211ce6bdfe274f6d8cd56b9a0df01962443c60c401c96e2219330' 
  AND token = 'pYtBbcvx2bMex5ZgaUfX4ENO4BYj20uYo5FbED2upuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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