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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62c01d5097345c690fa3d63e7f675937cc284cd129bba55a6fb5d26ead4320b' 
  AND token = 'Ky84hde50RtlUg37K/piNTRrvndPb+XUy6UocF0V3BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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