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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c76b75052291f37f586847b183dfb78870cb467304e3b9774174cc4db808472' 
  AND token = 'SoDRWk/DVdXp8RudATnifnQhq7vM830kh6VlkPiXoMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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