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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0694f63bd2d7cef2baa8b328401966aff0b7579ef6cbced2105f4c9a5c7781af' 
  AND token = 'Ts7B8iJMRezdcxZpmUQ2oGibjdMF0sUn2RI9xipcwW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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