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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef429eb4be7d3bc7d841e9650bfedd4dbfd1956905caa21b1105e9151d6a1e6' 
  AND token = 'xgYlJIzUbGJj5H0fWipscZzXwKyyrc+ijurNK5+nNKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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