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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bbb60c1aa10e4306b2d5347bd7791ad3d008c19d6f2bce0be181e7ba29255da' 
  AND token = 's25b1yfHLtbarJrrvOQMzMwyCUSyv3fkDe3/TrYf9Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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