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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c695b246b9a023aef8388a9183542a825b38c93e2d7059301439f1dcab782f' 
  AND token = 'AthfL6b8zc5VW4OrpdgNurslC57jtcvv3lg+Oa//JnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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