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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6774380dcaa75285e8b29da183e87f2fe4f1f89140890e4b5906ebb6f5d6601b' 
  AND token = 'B6cPbjdvgGse56bT/mApn4soDv2FzNjw6Zyonu+nSy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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