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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34848d8f2216ba68f6583a20b47bc2c898255892aaf31c3436ee04fa20a3303e' 
  AND token = '+XH5ucgiekld4dT7g0cTbo6agzu3qK7npSN7eN5PmX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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