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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7750f601bb9bb8a7ac07bde556c62b5b28eb07bdb2330441b57bbe7ce2b51d' 
  AND token = 'VuyFN/GPsrovhCLMEquCxFAg6iJfZgYnqgsWW7QPt2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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