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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa28f93dec117ab5d00095803180bd77f0e205cce547587e51b51db78ca550f' 
  AND token = 'QLG/a9APJpQU0jidxaFXeBpJJF/0gtpjXIRWIZqZx18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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