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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9ed4eff543784c233add2ac36ae5d88f2e7f642551dad8a9945160b0b400b4' 
  AND token = 'Vt8P2dA6Slevm8J2EiNzPXvGhaViwG/qls/Nv0LCLJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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