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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e725711c5cacd25b5e0efc2b251d6b75b55a6d24152be74502814191f8961ac' 
  AND token = 'QgPeDbF83yLUVIm6FK3eIXBfPJ6F6YGXHwijyWJUZ/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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