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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ca7c1f400cabae24f810ecf97afbc0809273e9f2ae19f74d1e8daa5fa930906' 
  AND token = 'M2D3X4SgY9P0l/zf8P3qly1jgjl+33CYWEfidHTHGo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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