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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c823cf5f29f991a2d78a9ed2d2ea2441cc0d2785fcc8a952baaefb99c338ae88' 
  AND token = 'X3aCbr3pWp/xMJVHFYoCJNImF3rYvfw6xbYSiYlEBr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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