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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0303032d087fddbf480de37c3264bb25503f429b3475a0ae60df96f29727f8e0' 
  AND token = 'q3+zt11qjg7EB2nc7rKLNGgfUOU5cuD7hGy5nFhR7uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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