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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93976647b02448f9a6ef27437703341b6cd0debe5c2b15da64b5fccb8d7b5db9' 
  AND token = 'Hg5jjsdpeilNMh3JX0ODIGuB5bT6qChfFnUFbqwORCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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