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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64918afdbc85e2f84c9cef45b93a81f372f75aa74ba824ae6c0ae0d4e1d05f5a' 
  AND token = 'tjRIlCNi5OwMDLYR1TzP3PVP9jk3J+mG+YBN28E1yGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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