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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d4712b08bf079466a399937558b88c91b34050c51ad5e45fadc591fc8dac9a2' 
  AND token = '93esgAQ+nDDDV06B5xkB/sVALXXD3JXbTRrfkDnt+qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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