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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01349da7d14d5253f3c814379519ac6b56ea95b9f7b34401d85648085e5434ac' 
  AND token = 'MiHew0l1GuKSVZcJveIU7B2a9/aMrbcocVselr0DUOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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