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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7be5edf8aeff80507ad04347a8b2e6e80a79d81455ff11cad9ab0c0bb70c0bc' 
  AND token = '7xL/5cSnZenm5v9XIvwZL4o0gIaASWSCSM109ifkrvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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