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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3f9ab963e9d773cd08edd0ecd2bfbc60ec9001a4d2f584c3568deddeddeab8' 
  AND token = 'Wap6utwDtNXzN30aVtEB5JcLMM15HtjbyVI3r2n9bc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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