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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a611bbe724e8eb8013309a17148d6952caa4d744ddc388aa97dfa3c703badf40' 
  AND token = '6YIvnFxiY263AbSaZ8Y3mvjs9WDnfD7ZELq71ohoqM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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