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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c1207786e4e3a00bf5d8f24fb6d4e88e5f5b26e4d930e39e6ce25395753c00' 
  AND token = 'VzKm5iPtvSeXlA3R+HzbvXvz6FLeOSAlXHJabRhNlZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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