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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd345de8149dc363d8d2d2f71f7546908af9700151c4c88ea3161bd4aaa0a25b' 
  AND token = 'QqWLSDx05UJ53vyQW7FpmI64Xc+Cf2QSHv/Hauxql5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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