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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8772a4044671c358d37d8637145534b5889adf6309b8ca053212bc5330987a92' 
  AND token = 'cf1MPzI6YmTKoPr+oOOYxQD+MZWdPj42eBpTU8g71zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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